168 



Muscles of the Back. 



VJ1I 



222. The Broad Muscles 

 of the Back 



M. cucullaris sen tra- 

 pezius (see Fig. 221). Orig.: 

 Superior curved line, ex- 

 ternal protuberance of the 

 occipital bone, Ligamentum 

 nucliae, spinous processes 

 of the seventh cervical 

 and all the dorsal vertebrae 

 andsupraspinous ligament. 

 Insert. : Posterior border 

 of the spine of the scapula, 

 inner border of the acro- 

 mion process and acromial 

 extremity of the clavicle. 

 (Rotator of the scapula.) 



M. latissimus dorsi, 

 the broadest muscle of 

 the back (see Fig. 221). 

 Orig. : By an aponeurosis 

 (Fascia lumbo-dorsalis) from 

 the spinous processes of 

 the four or six lower dor- 

 sal, and of all the lumbar 

 and sacral vertebrae, from 

 the external lip of the crest 

 of the ilium and the lowest 

 ribs. Insert. : Posterior 

 bicipital ridge (Spina tuber- 

 cuU minor is) of the hume- 

 rus, adherent to the ten- 

 don of the J/. tares major. 

 (Draws the humerus 

 backwards.) 



J/J/. rhomboideus major 

 ft minor. Orig. : Spinous 

 processes of the two in- 

 ferior cervical and four 

 upper dorsal vertebrae. 

 Insert. : Into the inner bor- 

 der of the scapula. (Rotate 

 the scapula and draw it 

 backwards.) 



